adding / supplementing AGM with Lifep04

[royw]

I currently have one solar panel (not sure of wattage) LR2181 charger (needs sorting) ebl218 and two agm batteries 95AH (brand new) 2kw Waeco inverter msi1812 Now I was thinking of adding say a 200AH lithium battery 2nd panel and a victron solar controller just wondering if there is a way to join this all together or running as seperate circuit with seperate inverter or should i just do a complete switch to lithium and get two 200ah ditch the lr218 put the solar panels in series and disconnect the EBL as it does not have a lithium profile and then add a further ac > 12 lithium charger any thoughts ?

 

[Bessy765]

AGM batteries are not really suited to the type of load you may require trying to run anywhere near 2000 watts
as a rule of thumb AGM discharge should be no more than 10% of their capacity. You will use app 28 amps @ 12 volt d.c. to produce 1 amp @ 240 volts a.c. Allowing for losses and voltage drop. Lithium and AGM Dom’s mix well. If you need that much power go Lithium only and make sure you have the correct charging set up.

 

[autorouter]

I basically agree with Bessy765. However if you are an incurable tinkerer, there is a view that you will probably need a new B2B to charge the Lithium, and if you also get another panel and victron controller that will be enough to keep the Lithium battery supplied. You could get a separate mains charger with Lithium profile connected to the Lithium battery only. Then you could get one of those marine battery changeover switches so you can switch between batteries supplying the inverter.

If you have a long-term view of replacing the AGMs with Lithium, you could take that into account when buying the B2B, solar controller and mains charger.

 

[Pausim]

I have one LiFePO4 and don’t think it would sit comfortably alongside AGM because they have different voltage profiles. I have not bothered changing my mains charger, which probably slightly undercharges the battery on the gel setting. Undercharging LiFePO4 does no harm and when on a hook up it really doesn’t matter if it is not full. I have a B2B with a Lithium profile which makes sure the battery is fully charged when I arrive where there is no hook up.

 

[royw]

I have one LiFePO4 and don’t think it would sit comfortably alongside AGM because they have different voltage profiles. I have not bothered changing my mains charger, which probably slightly undercharges the battery on the gel setting. Undercharging LiFePO4 does no harm and when on a hook up it really doesn’t matter if it is not full. I have a B2B with a Lithium profile which makes sure the battery is fully charged when I arrive where there is no hook up.

Which B2B charger and which battery do you have ?

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[Pausim]

I have a Relion 100Ah and a Votronic B2B.